“INVISIBLE INKLING,” by Emily Jenkins, illustrated by Harry Bliss, Balzer + Bray, April 26, 2011, hardback $14.99, (ages 7 and up) — paperback available April 24, 2012 Hank Wolowitz’s best friend has moved, and now he feels all alone. He misses their adventures as pretend spies, and wishes he had help dealing with the bully…